With the help of high technology, more and more new substances ___in the past fe
题型:不详难度:来源:
With the help of high technology, more and more new substances ___in the past few years.A.discovered | B.have discovered | C.had been discovered | D.have been discovered |
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答案
D |
解析
试题分析:考查时态。根据时间状语in the past few years,说明使用现在完成时。根据句意说明使用被动形式。句意:因为有高科技的帮助,早最近几年中,越来越多的物质已经被发现了。故D正确。 点评:对于时态的考查要从关键词着手,也要在语境中进行。 |
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